【摘要】 吸附-扩散模型基于离子交换膜固定电荷理论,涉及离子选择性系数和透膜扩散通量,通过三种离子交换膜内VO2+吸附平衡和透膜扩散实验,由吸附-扩散模型计算钒离子透膜扩散系数,揭示钒离子透膜传质过程。膜面FT-IR红外谱揭示基膜内不饱和键及RSO3-交换能力是影响膜稳定性和VO2+膜内吸附量主要因素,膜面光滑、平整能有效地降低VO2+吸附,抑制膜内水吸附和VO2+透膜扩散。该模型能较真实揭示钒离子透膜传质过程,可快速有效的筛选电池隔膜,并指导高性能钒电池隔膜制备。更多还原

【Abstract】 The experimental parameters of selectivity coefficient and diffusion flux are included in the adsorption-diffusion model based on the fixed charge theory in ion-exchange membrane.In this paper,three kinds of membrane and VO2+ electrolyte were selected to obtain these parameters with the experiments of adsorption equilibrium and VO2+ diffusion across the membranes.The diffusion coefficients of VO2+ across membrane were calculated and the transfer process was described by using the adsorption-diffusion model.The analysis of membrane composition revealed that unsaturated bond and exchange capacity of RSO3-are critical factors of the stability and VO2+ adsorption in membrane.The smooth and flat membrane surface inhibits effectively the adsorption of VO2+ and water in membrane and VO2+ transfer across membrane.The adsorption-diffusion model should present the real mass transfer of vanadium ions across membrane to effectively select membrane and guide preparation of high performance membrane for all vanadium redox flow battery.更多还原